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1 ## Copyright (C) 2007 David Bateman |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} plotyy (@var{x1}, @var{y1}, @var{x2}, @var{y2}) |
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21 ## @deftypefnx {Function File} {} plotyy (@dots{}, @var{fun}) |
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22 ## @deftypefnx {Function File} {} plotyy (@dots{}, @var{fun1}, @var{fun2}) |
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23 ## @deftypefnx {Function File} {} plotyy (@var{h}, @dots{}) |
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24 ## @deftypefnx {Function File} {[@var{ax}, @var{h1}, @var{h2}] =} plotyy (@dots{}) |
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25 ## Plots two sets of data with independent y-axes. The arguments @var{x1} and |
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26 ## @var{y1} define the arguments for the first plot and @var{x1} and @var{y2} |
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27 ## for the second. |
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28 ## |
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29 ## By default the arguments are evaluated with |
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30 ## @code{feval (@@plot, @var{x}, @var{y})}. However the type of plot can be |
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31 ## modified with the @var{fun} argument, in which case the plots are |
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32 ## generated by @code{feval (@var{fun}, @var{x}, @var{y})}. @var{fun} can be |
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33 ## a function handle, an inline function or a string of a function name. |
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34 ## |
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35 ## The function to use for each of the plots can be independently defined |
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36 ## with @var{fun1} and @var{fun2}. |
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37 ## |
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38 ## If given, @var{h} defines the principal axis in which to plot the @var{x1} |
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39 ## and @var{y1} data. The return value @var{ax} is a two element vector with |
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40 ## the axis handles of the two plots. @var{h1} and @var{h2} are handles to |
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41 ## the objects generated by the plot commands. |
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42 ## |
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43 ## @example |
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44 ## @group |
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45 ## x = 0:0.1:2*pi; |
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46 ## y1 = sin (x); |
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47 ## y2 = exp (x - 1); |
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48 ## ax = plotyy (x, y1, x - 1, y2, @@plot, @@semilogy); |
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49 ## xlabel ("X"); |
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50 ## ylabel (ax(1), "Axis 1"); |
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51 ## ylabel (ax(2), "Axis 2"); |
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52 ## @end group |
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53 ## @end example |
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54 ## @end deftypefn |
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55 |
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56 function [Ax, H1, H2] = plotyy (varargin) |
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57 |
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58 if (isscalar (varargin{1}) && ishandle (varargin{1})) |
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59 ax = varargin {1}; |
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60 if (! strcmp (get (ax, "type"), "axes")) |
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61 error ("plotyy: expecting first argument to be an axes object"); |
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62 endif |
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63 if (nargin < 5) |
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64 print_usage (); |
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65 endif |
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66 oldh = gca (); |
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67 unwind_protect |
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68 axes (ax); |
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69 newplot (); |
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70 [ax, h1, h2] = __plotyy__ (ax, varargin{2:end}); |
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71 unwind_protect_cleanup |
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72 axes (oldh); |
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73 end_unwind_protect |
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74 else |
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75 if (nargin < 4) |
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76 print_usage (); |
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77 endif |
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78 newplot (); |
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79 [ax, h1, h2] = __plotyy__ (gca (), varargin{:}); |
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80 endif |
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81 |
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82 if (nargout > 0) |
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83 Ax = ax; |
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84 H1 = h1; |
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85 H2 = h2; |
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86 endif |
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87 |
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88 endfunction |
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89 |
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90 function [ax, h1, h2] = __plotyy__ (ax, x1, y1, x2, y2, varargin) |
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91 if (nargin > 5) |
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92 fun1 = varargin{1}; |
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93 else |
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94 fun1 = @plot; |
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95 endif |
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96 if (nargin > 6) |
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97 fun2 = varargin{2}; |
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98 else |
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99 fun2 = fun1; |
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100 endif |
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101 |
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102 xlim = [min([x1(:); x2(:)]), max([x1(:); x2(:)])]; |
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103 |
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104 h1 = feval (fun1, x1, y1); |
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105 set (ax(1), "ycolor", get (h1(1), "color")); |
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106 set (ax(1), "position", get (ax(1), "outerposition")); |
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107 set (ax(1), "xlim", xlim); |
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108 |
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109 cf = gcf (); |
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110 set (cf, "nextplot", "add"); |
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111 ax(2) = axes (); |
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112 colors = get (ax(1), "colororder"); |
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113 set (ax(2), "colororder", [colors(2:end,:); colors(1,:)]); |
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114 |
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115 h2 = feval (fun2, x2, y2); |
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116 set (ax(2), "yaxislocation", "right"); |
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117 set (ax(2), "ycolor", get (h2(1), "color")); |
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118 set (ax(2), "position", get (ax(1), "outerposition")); |
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119 set (ax(2), "xlim", xlim); |
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120 endfunction |
